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          <section id="custom-converter">
<h1>Custom Converter<a class="headerlink" href="#custom-converter" title="Link to this heading">#</a></h1>
<p>Sometimes the converters provided by Javet are not powerful enough. No problem. Javet allows defining custom converters. Here is a simple example about how to create a custom converter.</p>
<section id="design-a-pojo-converter">
<h2>Design a POJO Converter<a class="headerlink" href="#design-a-pojo-converter" title="Link to this heading">#</a></h2>
<p>A POJO converter usually is designed for the Java objects that are now owned by the application. So, it has to deal with reflection heavily. The following sample code runs in JDK 11. It's easy to tweak few API for JDK 8.</p>
<section id="define-pojo-object">
<h3>Define POJO Object<a class="headerlink" href="#define-pojo-object" title="Link to this heading">#</a></h3>
<p>Let's say you have a Pojo that allows you to define a name-value pair.</p>
<div class="highlight-java notranslate"><div class="highlight"><pre><span></span><span class="kd">public</span><span class="w"> </span><span class="kd">class</span> <span class="nc">Pojo</span><span class="w"> </span><span class="p">{</span>
<span class="w">    </span><span class="kd">private</span><span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="n">name</span><span class="p">;</span>
<span class="w">    </span><span class="kd">private</span><span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="n">value</span><span class="p">;</span>

<span class="w">    </span><span class="kd">public</span><span class="w"> </span><span class="nf">Pojo</span><span class="p">()</span><span class="w"> </span><span class="p">{</span>
<span class="w">        </span><span class="k">this</span><span class="p">(</span><span class="kc">null</span><span class="p">,</span><span class="w"> </span><span class="kc">null</span><span class="p">);</span>
<span class="w">    </span><span class="p">}</span>

<span class="w">    </span><span class="kd">public</span><span class="w"> </span><span class="nf">Pojo</span><span class="p">(</span><span class="n">String</span><span class="w"> </span><span class="n">name</span><span class="p">,</span><span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="n">value</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w">        </span><span class="k">this</span><span class="p">.</span><span class="na">name</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">name</span><span class="p">;</span>
<span class="w">        </span><span class="k">this</span><span class="p">.</span><span class="na">value</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">value</span><span class="p">;</span>
<span class="w">    </span><span class="p">}</span>

<span class="w">    </span><span class="kd">public</span><span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="nf">getName</span><span class="p">()</span><span class="w"> </span><span class="p">{</span>
<span class="w">        </span><span class="k">return</span><span class="w"> </span><span class="n">name</span><span class="p">;</span>
<span class="w">    </span><span class="p">}</span>

<span class="w">    </span><span class="kd">public</span><span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="nf">setName</span><span class="p">(</span><span class="n">String</span><span class="w"> </span><span class="n">name</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w">        </span><span class="k">this</span><span class="p">.</span><span class="na">name</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">name</span><span class="p">;</span>
<span class="w">    </span><span class="p">}</span>

<span class="w">    </span><span class="kd">public</span><span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="nf">getValue</span><span class="p">()</span><span class="w"> </span><span class="p">{</span>
<span class="w">        </span><span class="k">return</span><span class="w"> </span><span class="n">value</span><span class="p">;</span>
<span class="w">    </span><span class="p">}</span>

<span class="w">    </span><span class="kd">public</span><span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="nf">setValue</span><span class="p">(</span><span class="n">String</span><span class="w"> </span><span class="n">value</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w">        </span><span class="k">this</span><span class="p">.</span><span class="na">value</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">value</span><span class="p">;</span>
<span class="w">    </span><span class="p">}</span>
<span class="p">}</span>
</pre></div>
</div>
</section>
<section id="create-pojoconverter">
<h3>Create PojoConverter<a class="headerlink" href="#create-pojoconverter" title="Link to this heading">#</a></h3>
<p>Then, create a generic PojoConverter.</p>
<ul class="simple">
<li><p>It is generic enough to cover all kinds of Pojo objects in a recursive way.</p></li>
<li><p>There is no need to deal with primitive types because the parent converter handles that.</p></li>
<li><p>Always override the methods with depth as argument for circular structure detection.</p></li>
<li><p>Always increment the depth in recursive call.</p></li>
</ul>
<div class="highlight-java notranslate"><div class="highlight"><pre><span></span><span class="nd">@SuppressWarnings</span><span class="p">(</span><span class="s">&quot;unchecked&quot;</span><span class="p">)</span>
<span class="kd">public</span><span class="w"> </span><span class="kd">class</span> <span class="nc">PojoConverter</span><span class="w"> </span><span class="kd">extends</span><span class="w"> </span><span class="n">JavetObjectConverter</span><span class="w"> </span><span class="p">{</span>
<span class="w">    </span><span class="kd">public</span><span class="w"> </span><span class="kd">static</span><span class="w"> </span><span class="kd">final</span><span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="n">METHOD_PREFIX_GET</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">&quot;get&quot;</span><span class="p">;</span>
<span class="w">    </span><span class="kd">public</span><span class="w"> </span><span class="kd">static</span><span class="w"> </span><span class="kd">final</span><span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="n">METHOD_PREFIX_IS</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">&quot;is&quot;</span><span class="p">;</span>
<span class="w">    </span><span class="kd">protected</span><span class="w"> </span><span class="kd">static</span><span class="w"> </span><span class="kd">final</span><span class="w"> </span><span class="n">Set</span><span class="o">&lt;</span><span class="n">String</span><span class="o">&gt;</span><span class="w"> </span><span class="n">EXCLUDED_METHODS</span><span class="p">;</span>

<span class="w">    </span><span class="kd">static</span><span class="w"> </span><span class="p">{</span>
<span class="w">        </span><span class="n">EXCLUDED_METHODS</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">new</span><span class="w"> </span><span class="n">HashSet</span><span class="o">&lt;&gt;</span><span class="p">();</span>
<span class="w">        </span><span class="k">for</span><span class="w"> </span><span class="p">(</span><span class="n">Method</span><span class="w"> </span><span class="n">method</span><span class="w"> </span><span class="p">:</span><span class="w"> </span><span class="n">Object</span><span class="p">.</span><span class="na">class</span><span class="p">.</span><span class="na">getMethods</span><span class="p">())</span><span class="w"> </span><span class="p">{</span>
<span class="w">            </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">method</span><span class="p">.</span><span class="na">getParameterCount</span><span class="p">()</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="mi">0</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w">                </span><span class="n">String</span><span class="w"> </span><span class="n">methodName</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">method</span><span class="p">.</span><span class="na">getName</span><span class="p">();</span>
<span class="w">                </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">methodName</span><span class="p">.</span><span class="na">startsWith</span><span class="p">(</span><span class="n">METHOD_PREFIX_IS</span><span class="p">)</span><span class="w"> </span><span class="o">||</span><span class="w"> </span><span class="n">methodName</span><span class="p">.</span><span class="na">startsWith</span><span class="p">(</span><span class="n">METHOD_PREFIX_GET</span><span class="p">))</span><span class="w"> </span><span class="p">{</span>
<span class="w">                    </span><span class="n">EXCLUDED_METHODS</span><span class="p">.</span><span class="na">add</span><span class="p">(</span><span class="n">methodName</span><span class="p">);</span>
<span class="w">                </span><span class="p">}</span>
<span class="w">            </span><span class="p">}</span>
<span class="w">        </span><span class="p">}</span>
<span class="w">    </span><span class="p">}</span>

<span class="w">    </span><span class="nd">@Override</span>
<span class="w">    </span><span class="kd">protected</span><span class="w"> </span><span class="o">&lt;</span><span class="n">T</span><span class="w"> </span><span class="kd">extends</span><span class="w"> </span><span class="n">V8Value</span><span class="o">&gt;</span><span class="w"> </span><span class="n">T</span><span class="w"> </span><span class="nf">toV8Value</span><span class="p">(</span>
<span class="w">            </span><span class="n">V8Runtime</span><span class="w"> </span><span class="n">v8Runtime</span><span class="p">,</span><span class="w"> </span><span class="n">Object</span><span class="w"> </span><span class="n">object</span><span class="p">,</span><span class="w"> </span><span class="kd">final</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">depth</span><span class="p">)</span><span class="w"> </span><span class="kd">throws</span><span class="w"> </span><span class="n">JavetException</span><span class="w"> </span><span class="p">{</span>
<span class="w">        </span><span class="n">T</span><span class="w"> </span><span class="n">v8Value</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="kd">super</span><span class="p">.</span><span class="na">toV8Value</span><span class="p">(</span><span class="n">v8Runtime</span><span class="p">,</span><span class="w"> </span><span class="n">object</span><span class="p">,</span><span class="w"> </span><span class="n">depth</span><span class="p">);</span>
<span class="w">        </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">v8Value</span><span class="w"> </span><span class="o">!=</span><span class="w"> </span><span class="kc">null</span><span class="w"> </span><span class="o">&amp;&amp;</span><span class="w"> </span><span class="o">!</span><span class="p">(</span><span class="n">v8Value</span><span class="p">.</span><span class="na">isUndefined</span><span class="p">()))</span><span class="w"> </span><span class="p">{</span>
<span class="w">            </span><span class="k">return</span><span class="w"> </span><span class="n">v8Value</span><span class="p">;</span>
<span class="w">        </span><span class="p">}</span>
<span class="w">        </span><span class="n">Class</span><span class="w"> </span><span class="n">objectClass</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">object</span><span class="p">.</span><span class="na">getClass</span><span class="p">();</span>
<span class="w">        </span><span class="n">V8ValueObject</span><span class="w"> </span><span class="n">v8ValueObject</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">v8Runtime</span><span class="p">.</span><span class="na">createV8ValueObject</span><span class="p">();</span>
<span class="w">        </span><span class="k">for</span><span class="w"> </span><span class="p">(</span><span class="n">Method</span><span class="w"> </span><span class="n">method</span><span class="w"> </span><span class="p">:</span><span class="w"> </span><span class="n">objectClass</span><span class="p">.</span><span class="na">getMethods</span><span class="p">())</span><span class="w"> </span><span class="p">{</span>
<span class="w">            </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">method</span><span class="p">.</span><span class="na">getParameterCount</span><span class="p">()</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="mi">0</span><span class="w"> </span><span class="o">&amp;&amp;</span><span class="w"> </span><span class="n">method</span><span class="p">.</span><span class="na">canAccess</span><span class="p">(</span><span class="n">object</span><span class="p">))</span><span class="w"> </span><span class="p">{</span>
<span class="w">                </span><span class="n">String</span><span class="w"> </span><span class="n">methodName</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">method</span><span class="p">.</span><span class="na">getName</span><span class="p">();</span>
<span class="w">                </span><span class="n">String</span><span class="w"> </span><span class="n">propertyName</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="kc">null</span><span class="p">;</span>
<span class="w">                </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">methodName</span><span class="p">.</span><span class="na">startsWith</span><span class="p">(</span><span class="n">METHOD_PREFIX_IS</span><span class="p">)</span><span class="w"> </span><span class="o">&amp;&amp;</span><span class="w"> </span><span class="o">!</span><span class="n">EXCLUDED_METHODS</span><span class="p">.</span><span class="na">contains</span><span class="p">(</span><span class="n">methodName</span><span class="p">)</span>
<span class="w">                        </span><span class="o">&amp;&amp;</span><span class="w"> </span><span class="n">methodName</span><span class="p">.</span><span class="na">length</span><span class="p">()</span><span class="w"> </span><span class="o">&gt;</span><span class="w"> </span><span class="n">METHOD_PREFIX_IS</span><span class="p">.</span><span class="na">length</span><span class="p">())</span><span class="w"> </span><span class="p">{</span>
<span class="w">                    </span><span class="n">propertyName</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">methodName</span><span class="p">.</span><span class="na">substring</span><span class="p">(</span><span class="n">METHOD_PREFIX_IS</span><span class="p">.</span><span class="na">length</span><span class="p">(),</span><span class="w"> </span><span class="n">METHOD_PREFIX_IS</span><span class="p">.</span><span class="na">length</span><span class="p">()</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="mi">1</span><span class="p">).</span><span class="na">toLowerCase</span><span class="p">(</span><span class="n">Locale</span><span class="p">.</span><span class="na">ROOT</span><span class="p">)</span>
<span class="w">                            </span><span class="o">+</span><span class="w"> </span><span class="n">methodName</span><span class="p">.</span><span class="na">substring</span><span class="p">(</span><span class="n">METHOD_PREFIX_IS</span><span class="p">.</span><span class="na">length</span><span class="p">()</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="mi">1</span><span class="p">);</span>
<span class="w">                </span><span class="p">}</span><span class="w"> </span><span class="k">else</span><span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">methodName</span><span class="p">.</span><span class="na">startsWith</span><span class="p">(</span><span class="n">METHOD_PREFIX_GET</span><span class="p">)</span><span class="w"> </span><span class="o">&amp;&amp;</span><span class="w"> </span><span class="o">!</span><span class="n">EXCLUDED_METHODS</span><span class="p">.</span><span class="na">contains</span><span class="p">(</span><span class="n">methodName</span><span class="p">)</span>
<span class="w">                        </span><span class="o">&amp;&amp;</span><span class="w"> </span><span class="n">methodName</span><span class="p">.</span><span class="na">length</span><span class="p">()</span><span class="w"> </span><span class="o">&gt;</span><span class="w"> </span><span class="n">METHOD_PREFIX_GET</span><span class="p">.</span><span class="na">length</span><span class="p">())</span><span class="w"> </span><span class="p">{</span>
<span class="w">                    </span><span class="n">propertyName</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">methodName</span><span class="p">.</span><span class="na">substring</span><span class="p">(</span><span class="n">METHOD_PREFIX_GET</span><span class="p">.</span><span class="na">length</span><span class="p">(),</span><span class="w"> </span><span class="n">METHOD_PREFIX_GET</span><span class="p">.</span><span class="na">length</span><span class="p">()</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="mi">1</span><span class="p">).</span><span class="na">toLowerCase</span><span class="p">(</span><span class="n">Locale</span><span class="p">.</span><span class="na">ROOT</span><span class="p">)</span>
<span class="w">                            </span><span class="o">+</span><span class="w"> </span><span class="n">methodName</span><span class="p">.</span><span class="na">substring</span><span class="p">(</span><span class="n">METHOD_PREFIX_GET</span><span class="p">.</span><span class="na">length</span><span class="p">()</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="mi">1</span><span class="p">);</span>
<span class="w">                </span><span class="p">}</span>
<span class="w">                </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">propertyName</span><span class="w"> </span><span class="o">!=</span><span class="w"> </span><span class="kc">null</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w">                    </span><span class="k">try</span><span class="w"> </span><span class="p">(</span><span class="n">V8Value</span><span class="w"> </span><span class="n">v8ValueTemp</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">toV8Value</span><span class="p">(</span><span class="n">v8Runtime</span><span class="p">,</span><span class="w"> </span><span class="n">method</span><span class="p">.</span><span class="na">invoke</span><span class="p">(</span><span class="n">object</span><span class="p">),</span><span class="w"> </span><span class="n">depth</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="mi">1</span><span class="p">))</span><span class="w"> </span><span class="p">{</span>
<span class="w">                        </span><span class="n">v8ValueObject</span><span class="p">.</span><span class="na">set</span><span class="p">(</span><span class="n">propertyName</span><span class="p">,</span><span class="w"> </span><span class="n">v8ValueTemp</span><span class="p">);</span>
<span class="w">                    </span><span class="p">}</span><span class="w"> </span><span class="k">catch</span><span class="w"> </span><span class="p">(</span><span class="n">Exception</span><span class="w"> </span><span class="n">e</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w">                        </span><span class="n">e</span><span class="p">.</span><span class="na">printStackTrace</span><span class="p">();</span>
<span class="w">                    </span><span class="p">}</span>
<span class="w">                </span><span class="p">}</span>
<span class="w">            </span><span class="p">}</span>
<span class="w">        </span><span class="p">}</span>
<span class="w">        </span><span class="n">v8Value</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">(</span><span class="n">T</span><span class="p">)</span><span class="w"> </span><span class="n">v8ValueObject</span><span class="p">;</span>
<span class="w">        </span><span class="k">return</span><span class="w"> </span><span class="n">v8Value</span><span class="p">;</span>
<span class="w">    </span><span class="p">}</span>
<span class="p">}</span>
</pre></div>
</div>
</section>
<section id="ready-go">
<h3>Ready! Go!<a class="headerlink" href="#ready-go" title="Link to this heading">#</a></h3>
<p>Just write few lines of code to interact with Javet.</p>
<div class="highlight-java notranslate"><div class="highlight"><pre><span></span><span class="kd">public</span><span class="w"> </span><span class="kd">class</span> <span class="nc">TestPojo</span><span class="w"> </span><span class="p">{</span>
<span class="w">    </span><span class="kd">public</span><span class="w"> </span><span class="kd">static</span><span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="nf">main</span><span class="p">(</span><span class="n">String</span><span class="o">[]</span><span class="w"> </span><span class="n">args</span><span class="p">)</span><span class="w"> </span><span class="kd">throws</span><span class="w"> </span><span class="n">JavetException</span><span class="w"> </span><span class="p">{</span>
<span class="w">        </span><span class="n">Pojo</span><span class="o">[]</span><span class="w"> </span><span class="n">pojoArray</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">new</span><span class="w"> </span><span class="n">Pojo</span><span class="o">[]</span><span class="p">{</span>
<span class="w">                </span><span class="k">new</span><span class="w"> </span><span class="n">Pojo</span><span class="p">(</span><span class="s">&quot;Tom&quot;</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;CEO&quot;</span><span class="p">),</span>
<span class="w">                </span><span class="k">new</span><span class="w"> </span><span class="n">Pojo</span><span class="p">(</span><span class="s">&quot;Jerry&quot;</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;CFO&quot;</span><span class="p">)};</span>
<span class="w">        </span><span class="k">try</span><span class="w"> </span><span class="p">(</span><span class="n">V8Runtime</span><span class="w"> </span><span class="n">v8Runtime</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">V8Host</span><span class="p">.</span><span class="na">getNodeInstance</span><span class="p">().</span><span class="na">createV8Runtime</span><span class="p">())</span><span class="w"> </span><span class="p">{</span>
<span class="w">            </span><span class="n">v8Runtime</span><span class="p">.</span><span class="na">setConverter</span><span class="p">(</span><span class="k">new</span><span class="w"> </span><span class="n">PojoConverter</span><span class="p">());</span>
<span class="w">            </span><span class="n">v8Runtime</span><span class="p">.</span><span class="na">getGlobalObject</span><span class="p">().</span><span class="na">set</span><span class="p">(</span><span class="s">&quot;pojoArray&quot;</span><span class="p">,</span><span class="w"> </span><span class="n">pojoArray</span><span class="p">);</span>
<span class="w">            </span><span class="n">v8Runtime</span><span class="p">.</span><span class="na">getExecutor</span><span class="p">(</span><span class="s">&quot;console.log(pojoArray);&quot;</span><span class="p">).</span><span class="na">executeVoid</span><span class="p">();</span>
<span class="w">        </span><span class="p">}</span>
<span class="w">    </span><span class="p">}</span>
<span class="p">}</span>
</pre></div>
</div>
<p>The console output is:</p>
<div class="highlight-js notranslate"><div class="highlight"><pre><span></span><span class="p">[</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="nx">name</span><span class="o">:</span><span class="w"> </span><span class="s1">&#39;Tom&#39;</span><span class="p">,</span><span class="w"> </span><span class="nx">value</span><span class="o">:</span><span class="w"> </span><span class="s1">&#39;CEO&#39;</span><span class="w"> </span><span class="p">},</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="nx">name</span><span class="o">:</span><span class="w"> </span><span class="s1">&#39;Jerry&#39;</span><span class="p">,</span><span class="w"> </span><span class="nx">value</span><span class="o">:</span><span class="w"> </span><span class="s1">&#39;CFO&#39;</span><span class="w"> </span><span class="p">}</span><span class="w"> </span><span class="p">]</span>
</pre></div>
</div>
<p>This process is transparent and fully automated once the converter is set to <code class="docutils literal notranslate"><span class="pre">V8Runtime</span></code>.</p>
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